Mouth shield



FIG. 1 is a perspective view of a mouth shield showing my new design;

FIG. 2 is a front elevational view thereof;

FIG. 3 is a back elevational view thereof;

FIG. 4 is a right side elevational view thereof;

FIG. 5 is a left side elevational view thereof;

FIG. 6 is a top plan view thereof; and

FIG. 7 is a bottom plan view thereof; and,

FIG. 8 is an exploded, perspective view thereof.

The broken lines in the drawings depict part of the mouth shield that form no part of the claimed design. 

CLAIM The ornamental design for a mouth shield, as shown and described. 